{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T00:43:06.335Z","years_from_j2000":26.674,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"hd-19810","name":"HD 19810","class":"k1_iv_orange_subgiant","category":"star","object_type":"K1-IV orange subgiant","mag":7.22,"mag_band":"V","abs_mag":2.147,"abs_mag_band":"V","distance_ly":337.286790262705,"distance_method":"parallax","ra_deg":47.714745,"dec_deg":-11.12509,"epoch_ra_deg":48.038226,"epoch_dec_deg":-11.023913,"epoch_moved_arcsec":4.054,"pm_ra_mas_yr":107.26,"pm_dec_mas_yr":-107.66,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Eridanus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-19810","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"03109-1108","age_years":5100486800,"companions":[{"measured":2015,"magnitude":8.64,"components":"AB","discoverer_code":"ENG  12","separation_arcsec":143.3,"position_angle_deg":50}],"mass_solar":1.263,"radius_solar":5.161,"spectral_type":"K1-IV","color_index_bv":1.004,"luminosity_solar":12.055910077295344,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality C)","surface_gravity_log_g":2.987,"surface_temperature_k":4824,"proper_motion_ra_mas_yr":107.26,"proper_motion_dec_mas_yr":-107.66,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":13.4538},"designations":[{"catalog":"HD","designation":"HD 19810"},{"catalog":"HIP","designation":"HIP 14781"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T19:50:56.720Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}